1 The LORD said to Moses, "Yet one plague more I will bring upon Pharaoh and upon Egypt. Afterward he will let you go from here. When he lets you go, he will drive you away completely… 4 So Moses said, "Thus says the LORD: About midnight I will go out in the midst of Egypt, 5 and every firstborn in the land of Egypt shall die, from the firstborn of Pharaoh who sits on his throne, even to the firstborn of the slave girl who is behind the handmill, and all the firstborn of the cattle. 6 There shall be a great cry throughout all the land of Egypt, such as there has never been, nor ever will be again. 7 But not a dog shall growl against any of the people of Israel, either man or beast, that you may know that the LORD makes a distinction between Egypt and Israel.

(Exodus 11:1, 4-7 ESV)

1 The LORD said to Moses and Aaron in the land of Egypt, 2 "This month shall be for you the beginning of months. It shall be the first month of the year for you. 3 Tell all the congregation of Israel that on the tenth day of this month every man shall take a lamb according to their fathers' houses, a lamb for a household. 4 And if the household is too small for a lamb, then he and his nearest neighbor shall take according to the number of persons; according to what each can eat you shall make your count for the lamb…

7 "Then they shall take some of the blood and put it on the two doorposts and the lintel of the houses in which they eat it. 8 They shall eat the flesh that night, roasted on the fire; with unleavened bread and bitter herbs they shall eat it…

11 In this manner you shall eat it: with your belt fastened, your sandals on your feet, and your staff in your hand. And you shall eat it in haste. It is the LORD's Passover. 12 For I will pass through the land of Egypt that night, and I will strike all the firstborn in the land of Egypt, both man and beast; and on all the gods of Egypt I will execute judgments: I am the LORD. 13 The blood shall be a sign for you, on the houses where you are. And when I see the blood, I will pass over you, and no plague will befall you to destroy you, when I strike the land of Egypt. 14 "This day shall be for you a memorial day, and you shall keep it as a feast to the LORD; throughout your generations, as a statute forever, you shall keep it as a feast…

23 For the LORD will pass through to strike the Egyptians, and when he sees the blood on the lintel and on the two doorposts, the LORD will pass over the door and will not allow the destroyer to enter your houses to strike you. 24 You shall observe this rite as a statute for you and for your sons forever. 25 And when you come to the land that the LORD will give you, as he has promised, you shall keep this service. 26 And when your children say to you, 'What do you mean by this service?' 27 you shall say, 'It is the sacrifice of the LORD's Passover, for he passed over the houses of the people of Israel in Egypt, when he struck the Egyptians but spared our houses.'" And the people bowed their heads and worshiped. 28 Then the people of Israel went and did so; as the LORD had commanded Moses and Aaron, so they did.

(Exodus 12:1-4, 7-8, 11-14, 23-28 ESV)